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/*
* This file is part of the coreboot project.
*
* Copyright 2016 Google Inc.
* Copyright (C) 2016 Intel Corp.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#if !IS_ENABLED(CONFIG_C_ENVIRONMENT_BOOTBLOCK)
/* This file assembles the start of the romstage program by the order of the
* includes. Thus, it's extremely important that one pays very careful
* attention to the order of the includes. */
#include <arch/x86/prologue.inc>
#include <cpu/x86/32bit/entry32.inc>
#include <cpu/x86/fpu_enable.inc>
#if IS_ENABLED(CONFIG_SSE)
#include <cpu/x86/sse_enable.inc>
#endif
/*
* The assembly.inc is generated based on the requirements of the mainboard.
* For example, for ROMCC boards the MAINBOARDDIR/romstage.c would be
* processed by ROMCC and added. In non-ROMCC boards the chipsets'
* cache-as-ram setup files would be here.
*/
#include <generated/assembly.inc>
#else
/*
* This path is for stages that post bootblock when employing
* CONFIG_C_ENVIRONMENT_BOOTBLOCK. There's no need to re-load the gdt, etc
* as all those settings are cached within the processor. In order to
* continue with C code execution one needs to set stack pointer and clear
* CAR_GLOBAL variables that are stage specific.
*/
.section ".text._start", "ax", @progbits
.global _start
_start:
/* reset stack pointer to CAR stack */
mov $_car_stack_end, %esp
/* clear CAR_GLOBAL area as it is not shared */
cld
xor %eax, %eax
movl $(_car_global_end), %ecx
movl $(_car_global_start), %edi
sub %edi, %ecx
rep stosl
jmp car_stage_entry
/* This is here for linking purposes. */
.weak car_stage_entry
car_stage_entry:
1:
jmp 1b
#endif
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